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Pis'ma v Zh. Èksper. Teoret. Fiz., 2018, Volume 108, Issue 2, Pages 103–107 (Mi jetpl5627)  

CONDENSED MATTER

Effect of a rare-earth ion on the structural instability in RFe$_3$(BO$_3$)$_4$ crystals

M. S. Pavlovskiy, V. I. Zinenko, A. S. Shinkorenko

Kirensky Institute of Physics, Federal Research Center KSC, Siberian Branch, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk, Russia

Abstract: The dynamics of the crystal lattice of RFe$_3$(BO$_3$)$_4$ (R = Pr, Nd, Sm, Gd, Tb, Dy, and Ho) compounds in the high-symmetry $R32$ phase has been calculated. Significant changes in spectra of compounds with various rare-earth ions have been obtained only near the edge $\Lambda$ point of the Brillouin zone ($\mathbf{q}_\Lambda=1/3(-2\mathbf{ b}_1 + \mathbf{ b}_2 +\mathbf{ b}_3)$, where $\mathbf{ b}_1$, $\mathbf{ b}_2$, and $\mathbf{ b}_3$ are the reciprocal lattice vectors) for acoustic oscillation branches. A decrease in the frequency of an acoustic mode at the point $\Lambda$ has been revealed in all studied compounds. This frequency depends on the type of rare-earth ion and decreases from a compound with Pr to a compound with Ho down to imaginary values. Such a behavior of the frequency of the unstable acoustic mode is in good agreement with experimental data on the dependence of the temperature of the $R32\to P3_121$ structural phase transition on the type of rare-earth ion in ferroborates.

Funding Agency Grant Number
Russian Science Foundation 17-72-10122


DOI: https://doi.org/10.1134/S0370274X18140072

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English version:
Journal of Experimental and Theoretical Physics Letters, 2018, 108:2, 116–120

Bibliographic databases:

Document Type: Article
Received: 10.05.2018
Revised: 18.06.2018

Citation: M. S. Pavlovskiy, V. I. Zinenko, A. S. Shinkorenko, “Effect of a rare-earth ion on the structural instability in RFe$_3$(BO$_3$)$_4$ crystals”, Pis'ma v Zh. Èksper. Teoret. Fiz., 108:2 (2018), 103–107; JETP Letters, 108:2 (2018), 116–120

Citation in format AMSBIB
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\paper Effect of a rare-earth ion on the structural instability in RFe$_3$(BO$_3$)$_4$ crystals
\jour Pis'ma v Zh. \`Eksper. Teoret. Fiz.
\yr 2018
\vol 108
\issue 2
\pages 103--107
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\crossref{https://doi.org/10.1134/S0370274X18140072}
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